first find a common denominator
the common denominator is 8
since the denominator of the fraction 7/8 is already 8, it stays the same
now for the second fraction, since the denominator is 4 and you multiply 4 by 2 to get 8, multiply the numerator of the fraction1/4 by 2 as well
now your two fractions are 7/8-2/8
since the denominators are the same you just have to subtract the numerators
7-2=5
the answer is 5/8
Hoped this helped :)
